John frederick dtjke



APPLICATION FILED NOV-12,1917. l 3 1 3,075 Patented Aug. 12, 1919.

l I n UNITED STATES PATENT OFFICE.

JOHN FREDERICK DUKE, OF SHORTLANDS, ENG-LAN D.

NUT.

Specification of Iietters Patent.

Patented Aug. 12, 1919.

Application filed November 12, 1917. Serial No. 201,494.

To all whom it may concern:

Be it known that I, J OHN FREDERICK DUKE, a subject of the King of Great Britain and Ireland, of Shortlands, Kent, England, metallurgical chemist, have inventedscrewed, or the work or the flange of anothe nut.

In the drawings 1-- Figure l is a section of one form of nut v s. made in accordance with this invention.

Fig. 2 is an elevation of a modified construction.

Fig. 3 is a side view of the construction shown in Fig.2.

In the form shown'in Fig. 1 the face (2 of the nut a is recessed at a forming a flange b.

In use when itis desired to lock the nut in position the flange b is dented with a punch so as to slihtly dent the thread of the bolt.

This is su working loose b vibration or coming undone inadvertent y.

In the form shown in Figs. 2 and 3 the flange b is adapted to be dented by a punch or the like so as to dent the work against which it is screwed. Or when two nuts are placed on a bolt so that the flanges b come ack to back they may be locked together by a dent.

What I claim as my invention, and desire to secure by Letters Patent, is 1-- A nut having a threaded opening, a base, side walls, a face, and provided with an annular recess in its face surrounding said threaded openlng, said recess being curved initially toward said base, thence inwardlytoward the threaded openin and thence outwardly toward the side wal and forming a flange connected to the body of the nut by a relatively thin wall, the ortion of said flange nearest the side wal s being located beyond the portion of the recess nearest the threaded opening, thereby providing a curved pocket to receive and confine an indenting tool, the threaded opening being coextensive with said flange.

In witness whereof I signed my name.

JOHN FREDERICK DUKE.

have hereunto cient to prevent the nut from- 

